N56U Clone GUI on 4G Modem Help

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New Around Here
Thanks in advance for anyone taking the time to read.

I bought the ProntoNetworks 4G Modem PP14O and I am being throttled by Tmobile. I have tried to search how to avoid being throttled by the ISPs and it seems the only success comes from setting the TTL to 65. I am having trouble because there is no setting for TTL on the GUI. The modem it uses is the Quectel EC25, the GUI is a clone of the Asus N56U. There is a Console emulator on the GUI and I am able to send commands.

I have unsuccessfully tried sending the following variations of the command:

iptables -t mangle -I POSTROUTING -o <ModemName> -j TTL --ttl-set 65

setting <ModemName> to:
usb0, usb1, usb2, usb3
ttyUSB0, ttyUSB1, ttyUSB2, ttyUSB3

reply is "iptables: No chain/target/match by that name."

I am thinking that I just do not know what the modem name is but to be honest I am not at all knowledgeable and I have gotten this far by reading forum posts and I need detailed instructions to get anywhere.

Am I on the right path here?

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